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Dehydrogenation of ethylbenzene to styrene with CO2 overiron oxide-based catalysts.
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dCatalysis Today 158 (2010) 464–469
Contents lists available at ScienceDirect
Catalysis Today
journa l homepage: www.e lsev ier .com/ locate /ca t tod
ehydrogenation of ethylbenzene to styrene with CO2 over
ron oxide-based catalysts
in Ji a,?, Guili Chena, Junhu Wangb,??, Xinkui Wanga, Tao Zhangb
Department of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, PR China
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
r t i c l e i n f o
rticle history:
vailable online 19 August 2010
eywords:
thylbenzene
xidative dehydrogenation
a b s t r a c t
Thispaperdescribesdehydrogenation reactionof ethylbenzene to styrenewithCO2 over ironoxide-based
catalysts. Three catalysts of Fe2O3–MgO/-Al2O3, Fe2O3/MgAl2O4 andMgFe0.1Al1.9O4 with the samemolar
ratio of Mg/Fe/Al were prepared by impregnation and sol–gel methods. At 580 ?C, the ethylbenzene con-
version over MgFe0.1Al1.9O4 kept a value of 40% during the time on stream of 20h, whereas that over
Fe2O3/MgAl2O4 decreased rapidly from initial 50.0% to 27.4%. The properties of the catalysts were char-arbon dioxide
ron oxide-based catalysts
acterized by several techniques such as N2 adsorption/desorption, X-ray diffraction, thermogravimetry,
energy dispersive X-ray spectroscopy, Fourier transform-infrared spectroscopy, 57Fe M?ssbauer spec-
troscopy, temperature-programmed reduction, and temperature-programmed desorption of NH3 and
CO2. Itwas found that the iron species of these catalysts are different. InMgFe0.1Al1.9O4, all Fe3+ species are
incorporated in the spinel lattice. MgFe0.1Al1.9O4 shows high catalytic activity and stability in ethylben-
zene dehydrogenation reaction with CO2. Moreover, the weak surface acidity of MgFe0.1Al1.9O4 prevents
n durfrom the carbon formatio
. Introduction
Styrene (ST) is one of the most important raw materials for
ol
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